Another important definition for our purpose concern the notion of   canonical dimension. We will only give the essential here, and the reader interested in the details may consult [1]}. In our model, the divergence degree for an arbitrary Feynman graph \(\mathcal {G}\)  is given by [2]}, [3]}
\(\omega (\mathcal {G})=-2L(\mathcal {G})+(F(\mathcal {G})-R(\mathcal {G}))\) 
